Change Authentication modes to 'Mixed mode'

Hi,

SQL server management studio is not installed on my machine, I want to change authentication mode using SQLCMD prompt.

Can i do as follows

    EXEC xp_instance_regwrite

    N'HKEY_LOCAL_MACHINE',

    N'Software\Microsoft\MSSQLServer\MSSQLServer',

    N'LoginMode',

    REG_DWORD,

    2;